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Process and device for fluidized bed torrefaction and grinding of a biomass feed for subsequent gasification or combustion

a technology of fluidized bed and biomass feed, which is applied in the direction of wood particle drying, wood particle drying, and solid material drying, etc., can solve the problems of not finding a prior art process for torrefaction and grinding, and no information available regarding the technology used for torrefaction

Active Publication Date: 2014-12-02
INST FR DU PETROLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0054]The torrefaction and grinding unit of the present invention can achieve a mean residence time for the coarsest biomass particles which is generally in the range 10 to 40 minutes, preferably in the range 15 to 30 minutes.

Problems solved by technology

In contrast, there is practically no information available regarding the technology used for said torrefaction.
In general, we have not found a prior art process for torrefaction and grinding operating as a fluidized bed applied to particles with densities in the range 300 to 800 kg / m3, and with dimensions of the order of a few centimeters.

Method used

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  • Process and device for fluidized bed torrefaction and grinding of a biomass feed for subsequent gasification or combustion
  • Process and device for fluidized bed torrefaction and grinding of a biomass feed for subsequent gasification or combustion
  • Process and device for fluidized bed torrefaction and grinding of a biomass feed for subsequent gasification or combustion

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examples

[0089]The first example concerns a unit in accordance with the invention operating at atmospheric pressure and treating particles of biomass in the form of wood pellets with dimensions of 2 cm×3 cm×5 cm with a water content of 35% by weight with a view to obtaining particles less than 500 microns in size and with a water content of less than 5% by weight.

[0090]The feed flow velocity of the biomass to be treated is: 20000 tones / year, i.e. 2.31 tones / hour. The torrefaction and grinding unit of the invention corresponded to a conical sector with a peak angle β of 90° and had the following dimensions:

[0091]Total height: 2.5 m

[0092]Maximum diameter (at upper zone): 4.6 m

[0093]Diameter of grinder (lower zone): 0.5 m

[0094]Intermediate zone diameter: 0.5 to 3.6 m

[0095]Upper zone diameter: 3.6 to 4.6 m

[0096]Angle (α) of inclined wall to vertical: 43°

[0097]Velocity of fluidization in zone 1 and 2: 27.3 cm / s

[0098]Velocity of fluidization in zone 3: 6.3 cm / s

[0099]Mean void fraction of fluidized...

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Abstract

A process and a unit for fluidized bed torrefaction and grinding of particles of a biomass with a largest dimension of 2 cm to 5 cm, and which unit contains an envelope having a general shape of a sector having a) two substantially vertical walls delimiting that sector; and b) at least one inclined wall defining three zones, from bottom to top: a lower zone provided with a fluidization means, and provided with a grinder placed at the bottom of that zone; an intermediate zone (2) provided with a fluidization means; and an upper zone (3) provided with a fluidization means; and a pipe (11) for introducing the particles reaching into the unit to the level of the intermediate zone.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a process for preparing a feed containing fibrous lignocellulosic material, alone or mixed with a hydrocarbon cut in order to supply a gasification unit or a combustion system. The invention also allows wood chips to be prepared with a view to using them in the field of vinification processes.[0002]An important application of the device of the invention is the preparation of a lignocellulosic biomass type feed in order to produce of fuels termed “biofuels”.[0003]The production line for such biofuels includes a step for gasification supplied with the biomass feed in the form of small particles generally less than 1 mm in size, and with a water content which is generally less than 10% by weight.[0004]The gasification step results in a gas essentially containing carbon monoxide and hydrogen, known to the skilled person as synthesis gas, and also as “syngas”. The synthesis gas can then allow a series of hydrocarbon cuts to be ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F26B3/08C10L5/40C10L5/44B01J8/18C10B53/02C10L9/08C10J3/54C10B49/10
CPCC10L5/44F26B2200/02Y02E50/14C10B49/10F26B2200/24F26B3/082C10J2300/0916B01J8/1872C10B53/02C10J2300/0903Y02E50/10Y02E50/30C10L9/083Y02E50/15C10J3/54Y02P20/145
Inventor ROLLAND, MATTHIEULOURET, SYLVAIN
Owner INST FR DU PETROLE
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